PROTECTIVE CIRCUIT FOR SELF-PROTECTED ELECTROMAGNET ACTUATORS, AND ALSO PROTECTIVE CIRCUIT FOR SELF-PROTECTED POWER SUPPLY SYSTEMS Russian patent published in 2009 - IPC H02H3/00 H03K17/08 

FIELD: electricity.

SUBSTANCE: protective circuit for self-protected electromagnet actuators, which are put in action by voltage of supply unit permitted to use in underground mining works for changeover of electrohydraulic valves in underground mining works, comprises at least two shorting facilities arranged separately from each other and connected parallel to coil of electromagnet actuator for shorting of coil (11), when coil potentials change. At least one of shorting facilities has a shorting semiconductor switch (16) and detector circuit (30) for detection of potential variance, with the help of which a shorting semiconductor switch (16) is activated.

EFFECT: improved reliability and safety of electromagnet actuators operation.

28 cl, 4 dwg